First time poster here asking for a little help, I just purchased a 2003 GT that has stock headers, stock H-pipe and bolt on flowmaster 40 series. First I'm a little disappointed in the rust from the flowmaster, car only has 32,000 miles, but I'm going stay with them. I would like to purchase a high flow catted X or H pipe, not sure of the emission rules in Michigan so I would rather be safe then sorry,also would like new headers. My problem(s) arewhich will sound better with the flowmaster an X or H pipe and which type of header to puchase short or long tube. I would like to maximize my horsepower and also have a good but different sound. My head is spinning from all the options, I have listened to different setups on you tube and I'm still lost. Any help would be appreciated.

 

Flows sound good with either one, but the H pipe is more favorable.

As of now, Michigan doesn't do emissions checks, so pretty much everyone runs O/R mid pipes.

 

o/r h is going to sound best with flowmasters... o/r x is best for power, but the power difference between the x and h is so minimal that choosing one over the other based on power is pointless, just get whichever sounds the best....and LT's are way better than shorties.... i would go with mac or bbk LT's, o/r h, and the flow 40s....dont get a catted pipe, cats are lame and theyre only for the environment hippies

 

welcome to the family i also have a 2003. MF has good people so im sure you will like it here

 

just add some MAC LT's and a MAC O/R-H to go with those flow 40's, and you'll be creamin your pannys every time you step on teh gas.

here is how mine sounds with stock headers, mac o/r - h, and flow 40's. enjoy! oh...and welcome to teh club/forum.

http://www.youtube.com/watch?v=giAUwj5peDQ

 

Thanks for the replies, I'm going with Mac Long Tubes, BBK does notmake themfor auto's. Ok last question Mac o/r H-pipe or Prochamber? If the sound is better with the Prochamber I will spend the extra money if not I will just go with the o/r H-pipe. Thanks again for your replies and the answer on Michigan emissions checks.